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The capacitance of a variable radio capa...

The capacitance of a variable radio capacitor can be cahanged from 50pF to 200pF by turning the dial from `0^(@)` to `180^(@)`. With the dial set at `180^(@)`, the capacitor is connected to a 400V battery. After cahrging, the capacitor is disconnected from the battery and dial is tuned at `0^(@)`?
(a) what is the p.d. across the capacitor when dial reads `0^(@)`?

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